BMC’s Yawkey building doors are now closed as an entrance as part of our ongoing efforts to enhance our campus and provide you with the best clinical care.

All patients and visitors on our main campus must enter our hospital via Shapiro, Menino, or Moakley buildings, where they will be greeted by team members at a new centralized check-in desk before continuing to the hospital. We are excited to welcome you and appreciate your patience as we improve our facilities.

Lactose Breath Hydrogen Test

Select your language:

The hydrogen breath test is used to identify one of two conditions: lactose intolerance or an abnormal growth of bacteria in the intestine. The patient will blow up a balloon-type bag. Then, the patient will drink a solution and breath samples will be collected every 15-20 minutes for up to 3 hours.